430 DETERMINATION OF THE FREEZING-POINT DEPRESSIONS 



The table also contains the values of the depression constant, 

 i. e., the lowering produced by each gramme-molecule or gramme- 

 ion of the electroyte in solution. It has been calculated by aid 

 of the expression : B = i (1 + a) where 8 is the equivalent depres- 

 sion, i is the constant and a is the ionization coefficient. This 

 formula only holds for electrolytes such as KC1 where the 

 gramme-molecule is equal to the gramme-equivalent and the 

 molecule breaks up into two ions. 



TABLE I.-KC1. (74.59). 



